| Effect of Dilute CHO Beverages on Performance in Cool and Warm Environments. | |
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MedLine Citation:
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PMID: 22251924 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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PURPOSE: The efficacy of drinks containing low concentrations of CHO (2%-6%) on physical performance in cool and warm environments was evaluated. METHODS: In two separate but related studies, 24 healthy males completed a familiarization trial and four trials to volitional exhaustion (TTE) at 70% V˙O2max in cool conditions (10°C, n = 12) or 60% V˙O2max in a warm environment (30°C, n = 12). Subjects ingested 0%, 2%, 4%, or 6% CHO solutions (sucrose, glucose, and fructose in a ratio of 50:25:25) immediately before exercise and every 10 min during exercise. RESULTS: TTE in 10°C was 102.6 ± 33.9, 109.2 ± 33.9, 121.0 ± 25.7, and 122.4 ± 29.9 min in the 0%, 2%, 4%, and 6% trials, respectively (P = 0.012). Compared with the 0% trial, TTE was longer in the 4% (P = 0.032, effect size (ES) = 0.72) and 6% (P = 0.044, ES = 0.66) trials. In addition, TTE was longer in the 6% trial than in the 2% trial (P = 0.025). TTE was also significantly influenced by drink CHO content at 30°C (0% = 94.5 ± 24.5 min, 2% = 104.1 ± 20.1 min, 4% = 105.5 ± 26.7 min, 6% = 112.0 ± 28.7 min; P = 0.046). No differences in TTE were apparent between the 0% and the 2% or 4% trials, but TTE was longer in the 6% trial compared with the placebo (P = 0.045, ES = 0.62). HR, core temperature, or rates of substrate oxidation were not affected by drink CHO content. CONCLUSIONS: These results demonstrate significant improvements in exercise capacity over the placebo trial when 4% and 6% CHO solutions were ingested at 10°C and a 6% CHO drink was ingested at 30°C. |
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Authors:
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Phillip Watson; Susan M Shirreffs; Ronald J Maughan |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 44 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-01-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 336-43 Citation Subset: IM; S |
Affiliation:
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School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, UNITED KINGDOM. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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